diff --git a/Cargo.lock b/Cargo.lock
index 8050792..f375035 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1053,9 +1053,11 @@ name = "moonfire-base"
 version = "0.0.1"
 dependencies = [
  "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.60 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 1.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
diff --git a/base/Cargo.toml b/base/Cargo.toml
index 8ca2997..790a6cc 100644
--- a/base/Cargo.toml
+++ b/base/Cargo.toml
@@ -13,7 +13,9 @@ path = "lib.rs"
 
 [dependencies]
 failure = "0.1.1"
+lazy_static = "1.0"
 libc = "0.2"
 log = "0.4"
 parking_lot = { version = "0.9", features = [] }
+regex = "1.0"
 time = "0.1"
diff --git a/base/strutil.rs b/base/strutil.rs
index ed4a992..776e88b 100644
--- a/base/strutil.rs
+++ b/base/strutil.rs
@@ -28,6 +28,66 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+use lazy_static::lazy_static;
+use regex::Regex;
+use std::fmt::Write as _;
+use std::str::FromStr as _;
+
+static MULTIPLIERS: [(char, u64); 4] = [
+    // (suffix character, power of 2)
+    ('T', 40),
+    ('G', 30),
+    ('M', 20),
+    ('K', 10),
+];
+
+/// Encodes a size into human-readable form.
+pub fn encode_size(mut raw: i64) -> String {
+    let mut encoded = String::new();
+    for &(c, n) in &MULTIPLIERS {
+        if raw >= 1i64<<n {
+            write!(&mut encoded, "{}{} ", raw >> n, c).unwrap();
+            raw &= (1i64 << n) - 1;
+        }
+    }
+    if raw > 0 || encoded.len() == 0 {
+        write!(&mut encoded, "{}", raw).unwrap();
+    } else {
+        encoded.pop();  // remove trailing space.
+    }
+    encoded
+}
+
+/// Decodes a human-readable size as output by encode_size.
+pub fn decode_size(encoded: &str) -> Result<i64, ()> {
+    let mut decoded = 0i64;
+    lazy_static! {
+        static ref RE: Regex = Regex::new(r"\s*([0-9]+)([TGMK])?,?\s*").unwrap();
+    }
+    let mut last_pos = 0;
+    for cap in RE.captures_iter(encoded) {
+        let whole_cap = cap.get(0).unwrap();
+        if whole_cap.start() > last_pos {
+            return Err(());
+        }
+        last_pos = whole_cap.end();
+        let mut piece = i64::from_str(&cap[1]).map_err(|_| ())?;
+        if let Some(m) = cap.get(2) {
+            let m = m.as_str().as_bytes()[0] as char;
+            for &(some_m, n) in &MULTIPLIERS {
+                if some_m == m {
+                    piece *= 1i64<<n;
+                    break;
+                }
+            }
+        }
+        decoded += piece;
+    }
+    if last_pos < encoded.len() {
+        return Err(());
+    }
+    Ok(decoded)
+}
 
 /// Returns a hex-encoded version of the input.
 pub fn hex(raw: &[u8]) -> String {
@@ -67,6 +127,11 @@ pub fn dehex(hexed: &[u8]) -> Result<[u8; 20], ()> {
 mod tests {
     use super::*;
 
+    #[test]
+    fn test_decode() {
+        assert_eq!(super::decode_size("100M").unwrap(), 100i64 << 20);
+    }
+
     #[test]
     fn round_trip() {
         let s = "de382684a471f178e4e3a163762711b0653bfd83";
diff --git a/db/db.rs b/db/db.rs
index 185b774..0d1fd81 100644
--- a/db/db.rs
+++ b/db/db.rs
@@ -53,6 +53,7 @@
 //!     cycles.
 
 use base::clock::{self, Clocks};
+use base::strutil::encode_size;
 use crate::auth;
 use crate::dir;
 use crate::raw;
@@ -72,6 +73,7 @@ use smallvec::SmallVec;
 use std::collections::{BTreeMap, VecDeque};
 use std::cell::RefCell;
 use std::cmp;
+use std::fmt::Write as _;
 use std::io::Write;
 use std::ops::Range;
 use std::mem;
@@ -555,7 +557,7 @@ fn adjust_days(r: Range<recording::Time>, sign: i64,
 }
 
 impl Stream {
-    /// Adds a single recording with the given properties to the in-memory state.
+    /// Adds a single fully committed recording with the given properties to the in-memory state.
     fn add_recording(&mut self, r: Range<recording::Time>, sample_file_bytes: i32) {
         self.range = Some(match self.range {
             Some(ref e) => cmp::min(e.start, r.start) .. cmp::max(e.end, r.end),
@@ -966,24 +968,36 @@ impl LockedDatabase {
         self.signal.flush(&tx)?;
         tx.commit()?;
 
+        #[derive(Default)]
+        struct DirLog {
+            added: SmallVec::<[CompositeId; 32]>,
+            deleted: SmallVec::<[CompositeId; 32]>,
+            gced: SmallVec::<[CompositeId; 32]>,
+            added_bytes: i64,
+            deleted_bytes: i64,
+        }
+        let mut dir_logs: FnvHashMap<i32, DirLog> = FnvHashMap::default();
+
         // Process delete_garbage.
-        let mut gced = SmallVec::<[CompositeId; 8]>::new();
-        for dir in self.sample_file_dirs_by_id.values_mut() {
-            gced.extend(dir.garbage_unlinked.drain(..));
+        for (&id, dir) in &mut self.sample_file_dirs_by_id {
+            if !dir.garbage_unlinked.is_empty() {
+                dir_logs.entry(id).or_default().gced.extend(dir.garbage_unlinked.drain(..));
+            }
         }
 
-        let mut added = SmallVec::<[CompositeId; 8]>::new();
-        let mut deleted = SmallVec::<[CompositeId; 8]>::new();
         for (stream_id, new_range) in new_ranges.drain() {
             let s = self.streams_by_id.get_mut(&stream_id).unwrap();
-            let d = self.sample_file_dirs_by_id.get_mut(&s.sample_file_dir_id.unwrap()).unwrap();
+            let dir_id = s.sample_file_dir_id.unwrap();
+            let d = self.sample_file_dirs_by_id.get_mut(&dir_id).unwrap();
+            let log = dir_logs.entry(dir_id).or_default();
 
             // Process delete_oldest_recordings.
             s.sample_file_bytes -= s.bytes_to_delete;
+            log.deleted_bytes += s.bytes_to_delete;
             s.bytes_to_delete = 0;
-            deleted.reserve(s.to_delete.len());
+            log.deleted.reserve(s.to_delete.len());
             for row in s.to_delete.drain(..) {
-                deleted.push(row.id);
+                log.deleted.push(row.id);
                 d.garbage_needs_unlink.insert(row.id);
                 let d = recording::Duration(row.duration as i64);
                 s.duration -= d;
@@ -991,11 +1005,12 @@ impl LockedDatabase {
             }
 
             // Process add_recordings.
+            log.added_bytes += s.bytes_to_add;
             s.bytes_to_add = 0;
-            added.reserve(s.synced_recordings);
+            log.added.reserve(s.synced_recordings);
             for _ in 0..s.synced_recordings {
                 let u = s.uncommitted.pop_front().unwrap();
-                added.push(CompositeId::new(stream_id, s.next_recording_id));
+                log.added.push(CompositeId::new(stream_id, s.next_recording_id));
                 s.next_recording_id += 1;
                 let l = u.lock();
                 let end = l.start + recording::Duration(l.duration_90k as i64);
@@ -1009,9 +1024,21 @@ impl LockedDatabase {
         self.auth.post_flush();
         self.signal.post_flush();
         self.flush_count += 1;
-        info!("Flush {} (why: {}): added {} recordings ({}), deleted {} ({}), marked {} ({}) GCed.",
-              self.flush_count, reason, added.len(), added.iter().join(", "), deleted.len(),
-              deleted.iter().join(", "), gced.len(), gced.iter().join(", "));
+        let mut log_msg = String::with_capacity(256);
+        for (&dir_id, log) in &dir_logs {
+            let dir = self.sample_file_dirs_by_id.get(&dir_id).unwrap();
+            write!(&mut log_msg,
+                   "\n{}: added {}B in {} recordings ({}), deleted {}B in {} ({}), \
+                   GCed {} recordings ({}).",
+                   &dir.path, &encode_size(log.added_bytes), log.added.len(),
+                   log.added.iter().join(", "), &encode_size(log.deleted_bytes), log.deleted.len(),
+                   log.deleted.iter().join(", "), log.gced.len(),
+                   log.gced.iter().join(", ")).unwrap();
+        }
+        if log_msg.is_empty() {
+            log_msg.push_str(" no recording changes");
+        }
+        info!("Flush {} (why: {}):{}", self.flush_count, reason, &log_msg);
         for cb in &self.on_flush {
             cb();
         }
diff --git a/db/writer.rs b/db/writer.rs
index d794219..e65529b 100644
--- a/db/writer.rs
+++ b/db/writer.rs
@@ -39,7 +39,7 @@ use crate::recording;
 use failure::{Error, bail, format_err};
 use fnv::FnvHashMap;
 use parking_lot::Mutex;
-use log::{debug, info, trace, warn};
+use log::{debug, trace, warn};
 use openssl::hash;
 use std::cmp::Ordering;
 use std::cmp;
@@ -205,9 +205,6 @@ pub fn lower_retention(db: Arc<db::Database>, dir_id: i32, limits: &[NewLimit])
             }
             if l.limit >= bytes_before { continue }
             delete_recordings(db, l.stream_id, extra)?;
-            let stream = db.streams_by_id().get(&l.stream_id).unwrap();
-            info!("stream {}, deleting: {}->{}", l.stream_id, bytes_before,
-                  stream.sample_file_bytes + stream.bytes_to_add - stream.bytes_to_delete);
         }
         Ok(())
     })
@@ -238,8 +235,6 @@ fn delete_recordings(db: &mut db::LockedDatabase, stream_id: i32,
         }
         false
     })?;
-    info!("{}: deleting {} bytes in {} recordings ({} bytes needed)",
-          stream_id, bytes_to_delete, n, bytes_needed);
     Ok(())
 }
 
diff --git a/src/cmds/config/cameras.rs b/src/cmds/config/cameras.rs
index 7af2898..ffaf332 100644
--- a/src/cmds/config/cameras.rs
+++ b/src/cmds/config/cameras.rs
@@ -28,6 +28,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+use base::strutil::{decode_size, encode_size};
 use crate::stream::{self, Opener, Stream};
 use cursive::Cursive;
 use cursive::traits::{Boxable, Identifiable, Finder};
@@ -37,7 +38,6 @@ use failure::Error;
 use std::collections::BTreeMap;
 use std::str::FromStr;
 use std::sync::Arc;
-use super::{decode_size, encode_size};
 use url::Url;
 
 /// Builds a `CameraChange` from an active `edit_camera_dialog`.
diff --git a/src/cmds/config/dirs.rs b/src/cmds/config/dirs.rs
index 31a6e09..e660f7d 100644
--- a/src/cmds/config/dirs.rs
+++ b/src/cmds/config/dirs.rs
@@ -28,6 +28,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+use base::strutil::{decode_size, encode_size};
 use cursive::Cursive;
 use cursive::traits::{Boxable, Identifiable};
 use cursive::views;
@@ -38,7 +39,6 @@ use std::cell::RefCell;
 use std::collections::BTreeMap;
 use std::rc::Rc;
 use std::sync::Arc;
-use super::{decode_size, encode_size};
 
 struct Stream {
     label: String,
diff --git a/src/cmds/config/mod.rs b/src/cmds/config/mod.rs
index a5d46ee..d91f224 100644
--- a/src/cmds/config/mod.rs
+++ b/src/cmds/config/mod.rs
@@ -38,12 +38,8 @@ use cursive::Cursive;
 use cursive::views;
 use db;
 use failure::Error;
-use lazy_static::lazy_static;
-use regex::Regex;
 use serde::Deserialize;
 use std::sync::Arc;
-use std::fmt::Write;
-use std::str::FromStr;
 
 mod cameras;
 mod dirs;
@@ -64,60 +60,6 @@ Options:
                            [default: /var/lib/moonfire-nvr/db]
 "#;
 
-static MULTIPLIERS: [(char, u64); 4] = [
-    // (suffix character, power of 2)
-    ('T', 40),
-    ('G', 30),
-    ('M', 20),
-    ('K', 10),
-];
-
-fn encode_size(mut raw: i64) -> String {
-    let mut encoded = String::new();
-    for &(c, n) in &MULTIPLIERS {
-        if raw >= 1i64<<n {
-            write!(&mut encoded, "{}{} ", raw >> n, c).unwrap();
-            raw &= (1i64 << n) - 1;
-        }
-    }
-    if raw > 0 || encoded.len() == 0 {
-        write!(&mut encoded, "{}", raw).unwrap();
-    } else {
-        encoded.pop();  // remove trailing space.
-    }
-    encoded
-}
-
-fn decode_size(encoded: &str) -> Result<i64, ()> {
-    let mut decoded = 0i64;
-    lazy_static! {
-        static ref RE: Regex = Regex::new(r"\s*([0-9]+)([TGMK])?,?\s*").unwrap();
-    }
-    let mut last_pos = 0;
-    for cap in RE.captures_iter(encoded) {
-        let whole_cap = cap.get(0).unwrap();
-        if whole_cap.start() > last_pos {
-            return Err(());
-        }
-        last_pos = whole_cap.end();
-        let mut piece = i64::from_str(&cap[1]).map_err(|_| ())?;
-        if let Some(m) = cap.get(2) {
-            let m = m.as_str().as_bytes()[0] as char;
-            for &(some_m, n) in &MULTIPLIERS {
-                if some_m == m {
-                    piece *= 1i64<<n;
-                    break;
-                }
-            }
-        }
-        decoded += piece;
-    }
-    if last_pos < encoded.len() {
-        return Err(());
-    }
-    Ok(decoded)
-}
-
 #[derive(Debug, Deserialize)]
 struct Args {
     flag_db_dir: String,
@@ -149,11 +91,3 @@ pub fn run() -> Result<(), Error> {
 
     Ok(())
 }
-
-#[cfg(test)]
-mod tests {
-    #[test]
-    fn test_decode() {
-        assert_eq!(super::decode_size("100M").unwrap(), 100i64 << 20);
-    }
-}